Grinding wheel dresser



March 15, 1966 G, J, DE FALCO 3,240,202

GRINDING WHEEL DRESSER Filed Oct. 18, 1962 2 Sheets-Sheet 1 5 Z V fq. l 7 49 "$3 Hill INVEN TOR. DE ZMK Armen/yf March 15, 1966 G. J. DE FALCO 3,240,202

GRINDING WHEEL DRES SER INVENTOR. 650855 FAZ 0 BY Mw fraz/Vm United States Patent O M 3,248,202 GREJDING WHEEL DRESSER George 3. De Falco, 5044 N. Calview, Baldwin Park, Calif. Filed Oct. 18, 1962, Ser. No. 231,346 2 Claims. (Cl. 12S-11) This invention relates to a grinding wheel dresser and more particularly to such a dresser which dresses the wheel from the top and in which not only are the parts arranged for extremely exact adjustments but, by reason of the fact that the dressing diamond is mounted at onethird of the length of a supporting fulcrurned bar a threeto-one reduction from template to the dress of the wheel is achieved.

Accordingly, it is the primary object of this invention to provide a dresser which embodies the above features and advantages.

It is another object of the invention to provide such an apparatus which, although capable of very tine adjustment, is simple, easy to maintain and economical.

These and other objects, features and advantages will be apparent from the annexed drawings in which:

FIGURE 1 is a side view of a device embodying the present invention;

FIGURE 2 is a section taken along the line 2 2 of FIGURE 1;

FIGURE 3 is an end view taken along the line 3-3 of FIGURE l;

FIGURE 4 is an end View taken along the line 4 4 of FIGURE l;

FIGURE 5 is a fragmentary View of the stylus and wheel showing the cutting of an angle;

FIGURE 6 is a top plan View of the device shown in FIGURE 1;

FIGURE 7 is an enlarged section taken along lthe line 7-7 of FIGURE l;

FIGURE 8 is an enlarged exploded perspective of the pattern holding block and template;

FIGURE 9 is a diagram showing the relationship between the template and dressed wheel;

FIGURE 10 is a fragmentary view, partly in section of the pattern holding block when provided with a precision block and sine bar;

FIGURE 11 is a fragmentary View of the dressed grinding wheel in use; and

FIGURE 12 is an exploded perspective of the sine bar and precision block.

Referring now more particularly to the drawings, the device is mounted on a frame 2G carrying a bearing 2l. in which is journalled a shaft 22, the outer end of which carries an adapter 23 on which is mounted the wheel 24 which it is desired to dress.

At the left end the frame 2i) has slidably mounted thereon a fulcrum block 25 having a central slot 26 for receiving the shaft of an adjusting stud 27. The upper end of fulcrum block 25 is provided with a pair of spaced ears 28 in which is mounted a rod 29 secured by set screws Si). A spherical bearing 31 is mounted on rod 29 and two coil springs 32 and 33 are mounted on rod 29 between ears 28 and bearing 31 as shown. Rod end 34 of fulcrum rod 35 is secured to bearing 31 by set screw 36.

One third of the distance between bearing 31 and stylus 37 is motmted a dressing diamond 3S secured adjustably by set screw 39.

At the right end frame carries a template mounting vise 40. Vise 40 is provided with spaced upstanding 3,249,262 Patented Mar. l5, 1966 lCe wings 41 and 42 providing a channel 43 in which is housed a leveling bar 44. Leveling bar 44 is adjusted by set screws 45 and 46. When using a template such as template 47 it rides on the leveling bar 44 and is held in the vise by thumb screw 48. A stylus 37 is mounted in a micrometer adjustment 49 carried by fulcrum bar 35.

The operation of the above-described device is as follows: shaft 22 is turned by a suitable motor. Micrometer 49 is adjusted as desired and the operator by hand traces the stylus 37 over the template 47. This causes the diamond point 38 to dress the desired pattern into wheel 24. However, the pattern is one-third as large as the pattern on template 47 and thus the very line accurlcy inherent in the device is niagnied by a factor of t ree.

Referring now to FIGURES 5, 10 and 12, there is illustrated the device when used with sine bar Sil and precision block 51. These are positioned as shown in FIGURE 1G which causes fulcrum bar to be turned so as to tilt diamond point 33 so as to -cut an angle on the Wheel as shown in FIGURE 5.

While there has been described what is at present con- Sidered a preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modiiications can be made therein without departing from the essence of the invention and it is intended to cover herein all such changes and modifications as come within the true spirit and scope of the appended claims.

I claim:

1. A grinding wheel dresser comprising: a frame; means to mount a wheel to be ground on a driven shaft; a fulcrurn bar pivotally mounted on said frame above said Wheel; a diamond point cutter carried by said fulcrum bar intermediate its ends and directly above said wheel; a template holder mounted on said frame adjacent the free end of said fulcrum bar; a stylus carried by said fulcrum bar and arranged to contact a template mounted in said template holder; said diamond point cutter being mounted in said ulcrum bar one-third the distance along said fulcrum bar from said pivotally mounted end to the mounting location of said stylus; said template holder including a leveling bar beneath said template and means for adjusting the height of said leveling bar to level said template; means for adjusting the height of the pivot point of said ulcrum bar on said frame; and a micrometer adjustment associated with said stylus for regulating the position of said stylus with respect to said fulcrum bar.

2. A wheel dresser as set forth in claim 1 in which said fulcrum bar is pivotable relative to said frame in both the lateral and vertical directions for accomplishing the tracing of said template.

References Cited by the Examiner UNITED STATES PATENTS 179,153 6/1876 Bonaventure 90-13.1

2,725,050 11/1955 Jakobsen 12S-11.1

2,781,614 2/1957 Garrison 12S-11.1

FOREIGN PATENTS 1,956 7 /1876 Great Britain. 509,480 10/1930 Germany. 5 69,227 5 1945 Great Britain.

ROBERT C. RIORDON, Primary Examiner. FRANK E. BAILEY, Examiner. 

1. A GRINDING WHEEL DRESSER COMPRISING: A FRAME; MEANS TO MOUNT A WHEEL TO BE GROUND ON A DRIVEN SHAFT; A FULCRUM BAR PIVOTALLY MOUNTED ON SAID FRAME ABOVE SAID WHEEL; A DIAMOND POINT CUTTER CARRIED BY SAID FULCRUM BAR INTERMEDIATE ITS ENDS AND DIRCTLY ABOVE SAID WHEEL; A TEMPLATE HOLDER MOUNTED ON SAID FRAME ADJACENT THE FREE END OF SAID FULCRUM BAR; A STYLUS CARRIED BY SAID FULCRUM BAR AND ARRANGED TO CONTACT A TEMPLATE MOUNTED IN SAID TEMPLATE HOLDER; SAID DIAMOND POINT CUTTER BEING MOUNTED IN SAID FULCUM BAR ONE-THIRD THE DIATANCE ALONG SAID FULCRUM BAR FROM SAID PIVOTALLY MOUNTED END TO THE MOUNTING LOCATION OF SAID STYLUS; SAID TEMPLATE HOLDER INCLUDING A LEVELING BAR BENEATH SAID TEMPLATE AND MEANS FOR ADJUSTING THE HEIGHT OF SAID LEVELING BAR TO LEVEL SAID TEMPLATE; MEANS FOR ADJUSTING THE HEIGHT OF THE PIVOT POINT OF SAID FULCRUM BAR ON SAID FRAME; AND A MICROMETER ADJUSTMENT ASSOCIATED WITH SAID STYLUS FOR REGULATING THE POSITION OF SAID STYLUS WITH RESPECT TO SAID FULCRUM BAR. 